手法を比較

	Pile Sorting	多次元尺度構成法 (MDS)
分野	Anthropology	統計学
系統	Process / pipeline	Latent structure
提唱年	1988	1952–1964
提唱者	Cognitive anthropology tradition (Weller & Romney; Borgatti)	Warren S. Torgerson (metric MDS, 1952); Joseph B. Kruskal (non-metric MDS, 1964)
種類	Elicitation procedure for perceived similarity among domain items	Dimensionality reduction / visualization
原典	Weller, S. C., & Romney, A. K. (1988). Systematic Data Collection. Qualitative Research Methods Series 10. Newbury Park, CA: Sage. ISBN: 9780803930742	Kruskal, J. B. (1964). Multidimensional scaling by optimizing goodness of fit to a nonmetric hypothesis. Psychometrika, 29(1), 1–27.
別名	Pile Sort Task, Free Pile Sort, Card Sorting (ethnographic), Sorting Task	MDS, metric MDS, non-metric MDS, proximity scaling
関連	4	5
概要	Pile sorting is an elicitation technique in which informants are handed a set of cards — one per item in a cultural domain — and asked to group them into piles of items that 'go together.' By recording which items each person places in the same pile and aggregating across many informants, the researcher builds a similarity matrix that reveals how the culture organizes the domain, which is then visualized with multidimensional scaling and clustering.	Multidimensional scaling maps objects described only by pairwise similarities or dissimilarities into a low-dimensional geometric space so that distances in that space reflect the original proximity structure as faithfully as possible. It is widely used to visualize the hidden structure of psychological, social, and behavioral data.